netdevice: safe convert to netdev_priv() #part-1
[linux-2.6.git] / drivers / net / 3c505.c
1 /*
2  * Linux Ethernet device driver for the 3Com Etherlink Plus (3C505)
3  *      By Craig Southeren, Juha Laiho and Philip Blundell
4  *
5  * 3c505.c      This module implements an interface to the 3Com
6  *              Etherlink Plus (3c505) Ethernet card. Linux device
7  *              driver interface reverse engineered from the Linux 3C509
8  *              device drivers. Some 3C505 information gleaned from
9  *              the Crynwr packet driver. Still this driver would not
10  *              be here without 3C505 technical reference provided by
11  *              3Com.
12  *
13  * $Id: 3c505.c,v 1.10 1996/04/16 13:06:27 phil Exp $
14  *
15  * Authors:     Linux 3c505 device driver by
16  *                      Craig Southeren, <craigs@ineluki.apana.org.au>
17  *              Final debugging by
18  *                      Andrew Tridgell, <tridge@nimbus.anu.edu.au>
19  *              Auto irq/address, tuning, cleanup and v1.1.4+ kernel mods by
20  *                      Juha Laiho, <jlaiho@ichaos.nullnet.fi>
21  *              Linux 3C509 driver by
22  *                      Donald Becker, <becker@super.org>
23  *                      (Now at <becker@scyld.com>)
24  *              Crynwr packet driver by
25  *                      Krishnan Gopalan and Gregg Stefancik,
26  *                      Clemson University Engineering Computer Operations.
27  *                      Portions of the code have been adapted from the 3c505
28  *                         driver for NCSA Telnet by Bruce Orchard and later
29  *                         modified by Warren Van Houten and krus@diku.dk.
30  *              3C505 technical information provided by
31  *                      Terry Murphy, of 3Com Network Adapter Division
32  *              Linux 1.3.0 changes by
33  *                      Alan Cox <Alan.Cox@linux.org>
34  *              More debugging, DMA support, currently maintained by
35  *                      Philip Blundell <philb@gnu.org>
36  *              Multicard/soft configurable dma channel/rev 2 hardware support
37  *                      by Christopher Collins <ccollins@pcug.org.au>
38  *              Ethtool support (jgarzik), 11/17/2001
39  */
40
41 #define DRV_NAME        "3c505"
42 #define DRV_VERSION     "1.10a"
43
44
45 /* Theory of operation:
46  *
47  * The 3c505 is quite an intelligent board.  All communication with it is done
48  * by means of Primary Command Blocks (PCBs); these are transferred using PIO
49  * through the command register.  The card has 256k of on-board RAM, which is
50  * used to buffer received packets.  It might seem at first that more buffers
51  * are better, but in fact this isn't true.  From my tests, it seems that
52  * more than about 10 buffers are unnecessary, and there is a noticeable
53  * performance hit in having more active on the card.  So the majority of the
54  * card's memory isn't, in fact, used.  Sadly, the card only has one transmit
55  * buffer and, short of loading our own firmware into it (which is what some
56  * drivers resort to) there's nothing we can do about this.
57  *
58  * We keep up to 4 "receive packet" commands active on the board at a time.
59  * When a packet comes in, so long as there is a receive command active, the
60  * board will send us a "packet received" PCB and then add the data for that
61  * packet to the DMA queue.  If a DMA transfer is not already in progress, we
62  * set one up to start uploading the data.  We have to maintain a list of
63  * backlogged receive packets, because the card may decide to tell us about
64  * a newly-arrived packet at any time, and we may not be able to start a DMA
65  * transfer immediately (ie one may already be going on).  We can't NAK the
66  * PCB, because then it would throw the packet away.
67  *
68  * Trying to send a PCB to the card at the wrong moment seems to have bad
69  * effects.  If we send it a transmit PCB while a receive DMA is happening,
70  * it will just NAK the PCB and so we will have wasted our time.  Worse, it
71  * sometimes seems to interrupt the transfer.  The majority of the low-level
72  * code is protected by one huge semaphore -- "busy" -- which is set whenever
73  * it probably isn't safe to do anything to the card.  The receive routine
74  * must gain a lock on "busy" before it can start a DMA transfer, and the
75  * transmit routine must gain a lock before it sends the first PCB to the card.
76  * The send_pcb() routine also has an internal semaphore to protect it against
77  * being re-entered (which would be disastrous) -- this is needed because
78  * several things can happen asynchronously (re-priming the receiver and
79  * asking the card for statistics, for example).  send_pcb() will also refuse
80  * to talk to the card at all if a DMA upload is happening.  The higher-level
81  * networking code will reschedule a later retry if some part of the driver
82  * is blocked.  In practice, this doesn't seem to happen very often.
83  */
84
85 /* This driver may now work with revision 2.x hardware, since all the read
86  * operations on the HCR have been removed (we now keep our own softcopy).
87  * But I don't have an old card to test it on.
88  *
89  * This has had the bad effect that the autoprobe routine is now a bit
90  * less friendly to other devices.  However, it was never very good.
91  * before, so I doubt it will hurt anybody.
92  */
93
94 /* The driver is a mess.  I took Craig's and Juha's code, and hacked it firstly
95  * to make it more reliable, and secondly to add DMA mode.  Many things could
96  * probably be done better; the concurrency protection is particularly awful.
97  */
98
99 #include <linux/module.h>
100 #include <linux/kernel.h>
101 #include <linux/string.h>
102 #include <linux/interrupt.h>
103 #include <linux/errno.h>
104 #include <linux/in.h>
105 #include <linux/slab.h>
106 #include <linux/ioport.h>
107 #include <linux/spinlock.h>
108 #include <linux/ethtool.h>
109 #include <linux/delay.h>
110 #include <linux/bitops.h>
111
112 #include <asm/uaccess.h>
113 #include <asm/io.h>
114 #include <asm/dma.h>
115
116 #include <linux/netdevice.h>
117 #include <linux/etherdevice.h>
118 #include <linux/skbuff.h>
119 #include <linux/init.h>
120
121 #include "3c505.h"
122
123 /*********************************************************
124  *
125  *  define debug messages here as common strings to reduce space
126  *
127  *********************************************************/
128
129 static const char filename[] = __FILE__;
130
131 static const char timeout_msg[] = "*** timeout at %s:%s (line %d) ***\n";
132 #define TIMEOUT_MSG(lineno) \
133         printk(timeout_msg, filename,__func__,(lineno))
134
135 static const char invalid_pcb_msg[] =
136 "*** invalid pcb length %d at %s:%s (line %d) ***\n";
137 #define INVALID_PCB_MSG(len) \
138         printk(invalid_pcb_msg, (len),filename,__func__,__LINE__)
139
140 static char search_msg[] __initdata = KERN_INFO "%s: Looking for 3c505 adapter at address %#x...";
141
142 static char stilllooking_msg[] __initdata = "still looking...";
143
144 static char found_msg[] __initdata = "found.\n";
145
146 static char notfound_msg[] __initdata = "not found (reason = %d)\n";
147
148 static char couldnot_msg[] __initdata = KERN_INFO "%s: 3c505 not found\n";
149
150 /*********************************************************
151  *
152  *  various other debug stuff
153  *
154  *********************************************************/
155
156 #ifdef ELP_DEBUG
157 static int elp_debug = ELP_DEBUG;
158 #else
159 static int elp_debug;
160 #endif
161 #define debug elp_debug
162
163 /*
164  *  0 = no messages (well, some)
165  *  1 = messages when high level commands performed
166  *  2 = messages when low level commands performed
167  *  3 = messages when interrupts received
168  */
169
170 /*****************************************************************
171  *
172  * List of I/O-addresses we try to auto-sense
173  * Last element MUST BE 0!
174  *****************************************************************/
175
176 static int addr_list[] __initdata = {0x300, 0x280, 0x310, 0};
177
178 /* Dma Memory related stuff */
179
180 static unsigned long dma_mem_alloc(int size)
181 {
182         int order = get_order(size);
183         return __get_dma_pages(GFP_KERNEL, order);
184 }
185
186
187 /*****************************************************************
188  *
189  * Functions for I/O (note the inline !)
190  *
191  *****************************************************************/
192
193 static inline unsigned char inb_status(unsigned int base_addr)
194 {
195         return inb(base_addr + PORT_STATUS);
196 }
197
198 static inline int inb_command(unsigned int base_addr)
199 {
200         return inb(base_addr + PORT_COMMAND);
201 }
202
203 static inline void outb_control(unsigned char val, struct net_device *dev)
204 {
205         outb(val, dev->base_addr + PORT_CONTROL);
206         ((elp_device *)(netdev_priv(dev)))->hcr_val = val;
207 }
208
209 #define HCR_VAL(x)   (((elp_device *)(netdev_priv(x)))->hcr_val)
210
211 static inline void outb_command(unsigned char val, unsigned int base_addr)
212 {
213         outb(val, base_addr + PORT_COMMAND);
214 }
215
216 static inline unsigned int backlog_next(unsigned int n)
217 {
218         return (n + 1) % BACKLOG_SIZE;
219 }
220
221 /*****************************************************************
222  *
223  *  useful functions for accessing the adapter
224  *
225  *****************************************************************/
226
227 /*
228  * use this routine when accessing the ASF bits as they are
229  * changed asynchronously by the adapter
230  */
231
232 /* get adapter PCB status */
233 #define GET_ASF(addr) \
234         (get_status(addr)&ASF_PCB_MASK)
235
236 static inline int get_status(unsigned int base_addr)
237 {
238         unsigned long timeout = jiffies + 10*HZ/100;
239         register int stat1;
240         do {
241                 stat1 = inb_status(base_addr);
242         } while (stat1 != inb_status(base_addr) && time_before(jiffies, timeout));
243         if (time_after_eq(jiffies, timeout))
244                 TIMEOUT_MSG(__LINE__);
245         return stat1;
246 }
247
248 static inline void set_hsf(struct net_device *dev, int hsf)
249 {
250         elp_device *adapter = netdev_priv(dev);
251         unsigned long flags;
252
253         spin_lock_irqsave(&adapter->lock, flags);
254         outb_control((HCR_VAL(dev) & ~HSF_PCB_MASK) | hsf, dev);
255         spin_unlock_irqrestore(&adapter->lock, flags);
256 }
257
258 static bool start_receive(struct net_device *, pcb_struct *);
259
260 static inline void adapter_reset(struct net_device *dev)
261 {
262         unsigned long timeout;
263         elp_device *adapter = netdev_priv(dev);
264         unsigned char orig_hcr = adapter->hcr_val;
265
266         outb_control(0, dev);
267
268         if (inb_status(dev->base_addr) & ACRF) {
269                 do {
270                         inb_command(dev->base_addr);
271                         timeout = jiffies + 2*HZ/100;
272                         while (time_before_eq(jiffies, timeout) && !(inb_status(dev->base_addr) & ACRF));
273                 } while (inb_status(dev->base_addr) & ACRF);
274                 set_hsf(dev, HSF_PCB_NAK);
275         }
276         outb_control(adapter->hcr_val | ATTN | DIR, dev);
277         mdelay(10);
278         outb_control(adapter->hcr_val & ~ATTN, dev);
279         mdelay(10);
280         outb_control(adapter->hcr_val | FLSH, dev);
281         mdelay(10);
282         outb_control(adapter->hcr_val & ~FLSH, dev);
283         mdelay(10);
284
285         outb_control(orig_hcr, dev);
286         if (!start_receive(dev, &adapter->tx_pcb))
287                 printk(KERN_ERR "%s: start receive command failed \n", dev->name);
288 }
289
290 /* Check to make sure that a DMA transfer hasn't timed out.  This should
291  * never happen in theory, but seems to occur occasionally if the card gets
292  * prodded at the wrong time.
293  */
294 static inline void check_3c505_dma(struct net_device *dev)
295 {
296         elp_device *adapter = netdev_priv(dev);
297         if (adapter->dmaing && time_after(jiffies, adapter->current_dma.start_time + 10)) {
298                 unsigned long flags, f;
299                 printk(KERN_ERR "%s: DMA %s timed out, %d bytes left\n", dev->name, adapter->current_dma.direction ? "download" : "upload", get_dma_residue(dev->dma));
300                 spin_lock_irqsave(&adapter->lock, flags);
301                 adapter->dmaing = 0;
302                 adapter->busy = 0;
303
304                 f=claim_dma_lock();
305                 disable_dma(dev->dma);
306                 release_dma_lock(f);
307
308                 if (adapter->rx_active)
309                         adapter->rx_active--;
310                 outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
311                 spin_unlock_irqrestore(&adapter->lock, flags);
312         }
313 }
314
315 /* Primitive functions used by send_pcb() */
316 static inline bool send_pcb_slow(unsigned int base_addr, unsigned char byte)
317 {
318         unsigned long timeout;
319         outb_command(byte, base_addr);
320         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
321                 if (inb_status(base_addr) & HCRE)
322                         return false;
323         }
324         printk(KERN_WARNING "3c505: send_pcb_slow timed out\n");
325         return true;
326 }
327
328 static inline bool send_pcb_fast(unsigned int base_addr, unsigned char byte)
329 {
330         unsigned int timeout;
331         outb_command(byte, base_addr);
332         for (timeout = 0; timeout < 40000; timeout++) {
333                 if (inb_status(base_addr) & HCRE)
334                         return false;
335         }
336         printk(KERN_WARNING "3c505: send_pcb_fast timed out\n");
337         return true;
338 }
339
340 /* Check to see if the receiver needs restarting, and kick it if so */
341 static inline void prime_rx(struct net_device *dev)
342 {
343         elp_device *adapter = netdev_priv(dev);
344         while (adapter->rx_active < ELP_RX_PCBS && netif_running(dev)) {
345                 if (!start_receive(dev, &adapter->itx_pcb))
346                         break;
347         }
348 }
349
350 /*****************************************************************
351  *
352  * send_pcb
353  *   Send a PCB to the adapter.
354  *
355  *      output byte to command reg  --<--+
356  *      wait until HCRE is non zero      |
357  *      loop until all bytes sent   -->--+
358  *      set HSF1 and HSF2 to 1
359  *      output pcb length
360  *      wait until ASF give ACK or NAK
361  *      set HSF1 and HSF2 to 0
362  *
363  *****************************************************************/
364
365 /* This can be quite slow -- the adapter is allowed to take up to 40ms
366  * to respond to the initial interrupt.
367  *
368  * We run initially with interrupts turned on, but with a semaphore set
369  * so that nobody tries to re-enter this code.  Once the first byte has
370  * gone through, we turn interrupts off and then send the others (the
371  * timeout is reduced to 500us).
372  */
373
374 static bool send_pcb(struct net_device *dev, pcb_struct * pcb)
375 {
376         int i;
377         unsigned long timeout;
378         elp_device *adapter = netdev_priv(dev);
379         unsigned long flags;
380
381         check_3c505_dma(dev);
382
383         if (adapter->dmaing && adapter->current_dma.direction == 0)
384                 return false;
385
386         /* Avoid contention */
387         if (test_and_set_bit(1, &adapter->send_pcb_semaphore)) {
388                 if (elp_debug >= 3) {
389                         printk(KERN_DEBUG "%s: send_pcb entered while threaded\n", dev->name);
390                 }
391                 return false;
392         }
393         /*
394          * load each byte into the command register and
395          * wait for the HCRE bit to indicate the adapter
396          * had read the byte
397          */
398         set_hsf(dev, 0);
399
400         if (send_pcb_slow(dev->base_addr, pcb->command))
401                 goto abort;
402
403         spin_lock_irqsave(&adapter->lock, flags);
404
405         if (send_pcb_fast(dev->base_addr, pcb->length))
406                 goto sti_abort;
407
408         for (i = 0; i < pcb->length; i++) {
409                 if (send_pcb_fast(dev->base_addr, pcb->data.raw[i]))
410                         goto sti_abort;
411         }
412
413         outb_control(adapter->hcr_val | 3, dev);        /* signal end of PCB */
414         outb_command(2 + pcb->length, dev->base_addr);
415
416         /* now wait for the acknowledgement */
417         spin_unlock_irqrestore(&adapter->lock, flags);
418
419         for (timeout = jiffies + 5*HZ/100; time_before(jiffies, timeout);) {
420                 switch (GET_ASF(dev->base_addr)) {
421                 case ASF_PCB_ACK:
422                         adapter->send_pcb_semaphore = 0;
423                         return true;
424
425                 case ASF_PCB_NAK:
426 #ifdef ELP_DEBUG
427                         printk(KERN_DEBUG "%s: send_pcb got NAK\n", dev->name);
428 #endif
429                         goto abort;
430                 }
431         }
432
433         if (elp_debug >= 1)
434                 printk(KERN_DEBUG "%s: timeout waiting for PCB acknowledge (status %02x)\n", dev->name, inb_status(dev->base_addr));
435         goto abort;
436
437       sti_abort:
438         spin_unlock_irqrestore(&adapter->lock, flags);
439       abort:
440         adapter->send_pcb_semaphore = 0;
441         return false;
442 }
443
444
445 /*****************************************************************
446  *
447  * receive_pcb
448  *   Read a PCB from the adapter
449  *
450  *      wait for ACRF to be non-zero        ---<---+
451  *      input a byte                               |
452  *      if ASF1 and ASF2 were not both one         |
453  *              before byte was read, loop      --->---+
454  *      set HSF1 and HSF2 for ack
455  *
456  *****************************************************************/
457
458 static bool receive_pcb(struct net_device *dev, pcb_struct * pcb)
459 {
460         int i, j;
461         int total_length;
462         int stat;
463         unsigned long timeout;
464         unsigned long flags;
465
466         elp_device *adapter = netdev_priv(dev);
467
468         set_hsf(dev, 0);
469
470         /* get the command code */
471         timeout = jiffies + 2*HZ/100;
472         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
473         if (time_after_eq(jiffies, timeout)) {
474                 TIMEOUT_MSG(__LINE__);
475                 return false;
476         }
477         pcb->command = inb_command(dev->base_addr);
478
479         /* read the data length */
480         timeout = jiffies + 3*HZ/100;
481         while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && time_before(jiffies, timeout));
482         if (time_after_eq(jiffies, timeout)) {
483                 TIMEOUT_MSG(__LINE__);
484                 printk(KERN_INFO "%s: status %02x\n", dev->name, stat);
485                 return false;
486         }
487         pcb->length = inb_command(dev->base_addr);
488
489         if (pcb->length > MAX_PCB_DATA) {
490                 INVALID_PCB_MSG(pcb->length);
491                 adapter_reset(dev);
492                 return false;
493         }
494         /* read the data */
495         spin_lock_irqsave(&adapter->lock, flags);
496         i = 0;
497         do {
498                 j = 0;
499                 while (((stat = get_status(dev->base_addr)) & ACRF) == 0 && j++ < 20000);
500                 pcb->data.raw[i++] = inb_command(dev->base_addr);
501                 if (i > MAX_PCB_DATA)
502                         INVALID_PCB_MSG(i);
503         } while ((stat & ASF_PCB_MASK) != ASF_PCB_END && j < 20000);
504         spin_unlock_irqrestore(&adapter->lock, flags);
505         if (j >= 20000) {
506                 TIMEOUT_MSG(__LINE__);
507                 return false;
508         }
509         /* woops, the last "data" byte was really the length! */
510         total_length = pcb->data.raw[--i];
511
512         /* safety check total length vs data length */
513         if (total_length != (pcb->length + 2)) {
514                 if (elp_debug >= 2)
515                         printk(KERN_WARNING "%s: mangled PCB received\n", dev->name);
516                 set_hsf(dev, HSF_PCB_NAK);
517                 return false;
518         }
519
520         if (pcb->command == CMD_RECEIVE_PACKET_COMPLETE) {
521                 if (test_and_set_bit(0, (void *) &adapter->busy)) {
522                         if (backlog_next(adapter->rx_backlog.in) == adapter->rx_backlog.out) {
523                                 set_hsf(dev, HSF_PCB_NAK);
524                                 printk(KERN_WARNING "%s: PCB rejected, transfer in progress and backlog full\n", dev->name);
525                                 pcb->command = 0;
526                                 return true;
527                         } else {
528                                 pcb->command = 0xff;
529                         }
530                 }
531         }
532         set_hsf(dev, HSF_PCB_ACK);
533         return true;
534 }
535
536 /******************************************************
537  *
538  *  queue a receive command on the adapter so we will get an
539  *  interrupt when a packet is received.
540  *
541  ******************************************************/
542
543 static bool start_receive(struct net_device *dev, pcb_struct * tx_pcb)
544 {
545         bool status;
546         elp_device *adapter = netdev_priv(dev);
547
548         if (elp_debug >= 3)
549                 printk(KERN_DEBUG "%s: restarting receiver\n", dev->name);
550         tx_pcb->command = CMD_RECEIVE_PACKET;
551         tx_pcb->length = sizeof(struct Rcv_pkt);
552         tx_pcb->data.rcv_pkt.buf_seg
553             = tx_pcb->data.rcv_pkt.buf_ofs = 0;         /* Unused */
554         tx_pcb->data.rcv_pkt.buf_len = 1600;
555         tx_pcb->data.rcv_pkt.timeout = 0;       /* set timeout to zero */
556         status = send_pcb(dev, tx_pcb);
557         if (status)
558                 adapter->rx_active++;
559         return status;
560 }
561
562 /******************************************************
563  *
564  * extract a packet from the adapter
565  * this routine is only called from within the interrupt
566  * service routine, so no cli/sti calls are needed
567  * note that the length is always assumed to be even
568  *
569  ******************************************************/
570
571 static void receive_packet(struct net_device *dev, int len)
572 {
573         int rlen;
574         elp_device *adapter = netdev_priv(dev);
575         void *target;
576         struct sk_buff *skb;
577         unsigned long flags;
578
579         rlen = (len + 1) & ~1;
580         skb = dev_alloc_skb(rlen + 2);
581
582         if (!skb) {
583                 printk(KERN_WARNING "%s: memory squeeze, dropping packet\n", dev->name);
584                 target = adapter->dma_buffer;
585                 adapter->current_dma.target = NULL;
586                 /* FIXME: stats */
587                 return;
588         }
589
590         skb_reserve(skb, 2);
591         target = skb_put(skb, rlen);
592         if ((unsigned long)(target + rlen) >= MAX_DMA_ADDRESS) {
593                 adapter->current_dma.target = target;
594                 target = adapter->dma_buffer;
595         } else {
596                 adapter->current_dma.target = NULL;
597         }
598
599         /* if this happens, we die */
600         if (test_and_set_bit(0, (void *) &adapter->dmaing))
601                 printk(KERN_ERR "%s: rx blocked, DMA in progress, dir %d\n", dev->name, adapter->current_dma.direction);
602
603         adapter->current_dma.direction = 0;
604         adapter->current_dma.length = rlen;
605         adapter->current_dma.skb = skb;
606         adapter->current_dma.start_time = jiffies;
607
608         outb_control(adapter->hcr_val | DIR | TCEN | DMAE, dev);
609
610         flags=claim_dma_lock();
611         disable_dma(dev->dma);
612         clear_dma_ff(dev->dma);
613         set_dma_mode(dev->dma, 0x04);   /* dma read */
614         set_dma_addr(dev->dma, isa_virt_to_bus(target));
615         set_dma_count(dev->dma, rlen);
616         enable_dma(dev->dma);
617         release_dma_lock(flags);
618
619         if (elp_debug >= 3) {
620                 printk(KERN_DEBUG "%s: rx DMA transfer started\n", dev->name);
621         }
622
623         if (adapter->rx_active)
624                 adapter->rx_active--;
625
626         if (!adapter->busy)
627                 printk(KERN_WARNING "%s: receive_packet called, busy not set.\n", dev->name);
628 }
629
630 /******************************************************
631  *
632  * interrupt handler
633  *
634  ******************************************************/
635
636 static irqreturn_t elp_interrupt(int irq, void *dev_id)
637 {
638         int len;
639         int dlen;
640         int icount = 0;
641         struct net_device *dev = dev_id;
642         elp_device *adapter = netdev_priv(dev);
643         unsigned long timeout;
644
645         spin_lock(&adapter->lock);
646
647         do {
648                 /*
649                  * has a DMA transfer finished?
650                  */
651                 if (inb_status(dev->base_addr) & DONE) {
652                         if (!adapter->dmaing) {
653                                 printk(KERN_WARNING "%s: phantom DMA completed\n", dev->name);
654                         }
655                         if (elp_debug >= 3) {
656                                 printk(KERN_DEBUG "%s: %s DMA complete, status %02x\n", dev->name, adapter->current_dma.direction ? "tx" : "rx", inb_status(dev->base_addr));
657                         }
658
659                         outb_control(adapter->hcr_val & ~(DMAE | TCEN | DIR), dev);
660                         if (adapter->current_dma.direction) {
661                                 dev_kfree_skb_irq(adapter->current_dma.skb);
662                         } else {
663                                 struct sk_buff *skb = adapter->current_dma.skb;
664                                 if (skb) {
665                                         if (adapter->current_dma.target) {
666                                         /* have already done the skb_put() */
667                                         memcpy(adapter->current_dma.target, adapter->dma_buffer, adapter->current_dma.length);
668                                         }
669                                         skb->protocol = eth_type_trans(skb,dev);
670                                         dev->stats.rx_bytes += skb->len;
671                                         netif_rx(skb);
672                                 }
673                         }
674                         adapter->dmaing = 0;
675                         if (adapter->rx_backlog.in != adapter->rx_backlog.out) {
676                                 int t = adapter->rx_backlog.length[adapter->rx_backlog.out];
677                                 adapter->rx_backlog.out = backlog_next(adapter->rx_backlog.out);
678                                 if (elp_debug >= 2)
679                                         printk(KERN_DEBUG "%s: receiving backlogged packet (%d)\n", dev->name, t);
680                                 receive_packet(dev, t);
681                         } else {
682                                 adapter->busy = 0;
683                         }
684                 } else {
685                         /* has one timed out? */
686                         check_3c505_dma(dev);
687                 }
688
689                 /*
690                  * receive a PCB from the adapter
691                  */
692                 timeout = jiffies + 3*HZ/100;
693                 while ((inb_status(dev->base_addr) & ACRF) != 0 && time_before(jiffies, timeout)) {
694                         if (receive_pcb(dev, &adapter->irx_pcb)) {
695                                 switch (adapter->irx_pcb.command)
696                                 {
697                                 case 0:
698                                         break;
699                                         /*
700                                          * received a packet - this must be handled fast
701                                          */
702                                 case 0xff:
703                                 case CMD_RECEIVE_PACKET_COMPLETE:
704                                         /* if the device isn't open, don't pass packets up the stack */
705                                         if (!netif_running(dev))
706                                                 break;
707                                         len = adapter->irx_pcb.data.rcv_resp.pkt_len;
708                                         dlen = adapter->irx_pcb.data.rcv_resp.buf_len;
709                                         if (adapter->irx_pcb.data.rcv_resp.timeout != 0) {
710                                                 printk(KERN_ERR "%s: interrupt - packet not received correctly\n", dev->name);
711                                         } else {
712                                                 if (elp_debug >= 3) {
713                                                         printk(KERN_DEBUG "%s: interrupt - packet received of length %i (%i)\n", dev->name, len, dlen);
714                                                 }
715                                                 if (adapter->irx_pcb.command == 0xff) {
716                                                         if (elp_debug >= 2)
717                                                                 printk(KERN_DEBUG "%s: adding packet to backlog (len = %d)\n", dev->name, dlen);
718                                                         adapter->rx_backlog.length[adapter->rx_backlog.in] = dlen;
719                                                         adapter->rx_backlog.in = backlog_next(adapter->rx_backlog.in);
720                                                 } else {
721                                                         receive_packet(dev, dlen);
722                                                 }
723                                                 if (elp_debug >= 3)
724                                                         printk(KERN_DEBUG "%s: packet received\n", dev->name);
725                                         }
726                                         break;
727
728                                         /*
729                                          * 82586 configured correctly
730                                          */
731                                 case CMD_CONFIGURE_82586_RESPONSE:
732                                         adapter->got[CMD_CONFIGURE_82586] = 1;
733                                         if (elp_debug >= 3)
734                                                 printk(KERN_DEBUG "%s: interrupt - configure response received\n", dev->name);
735                                         break;
736
737                                         /*
738                                          * Adapter memory configuration
739                                          */
740                                 case CMD_CONFIGURE_ADAPTER_RESPONSE:
741                                         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 1;
742                                         if (elp_debug >= 3)
743                                                 printk(KERN_DEBUG "%s: Adapter memory configuration %s.\n", dev->name,
744                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
745                                         break;
746
747                                         /*
748                                          * Multicast list loading
749                                          */
750                                 case CMD_LOAD_MULTICAST_RESPONSE:
751                                         adapter->got[CMD_LOAD_MULTICAST_LIST] = 1;
752                                         if (elp_debug >= 3)
753                                                 printk(KERN_DEBUG "%s: Multicast address list loading %s.\n", dev->name,
754                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
755                                         break;
756
757                                         /*
758                                          * Station address setting
759                                          */
760                                 case CMD_SET_ADDRESS_RESPONSE:
761                                         adapter->got[CMD_SET_STATION_ADDRESS] = 1;
762                                         if (elp_debug >= 3)
763                                                 printk(KERN_DEBUG "%s: Ethernet address setting %s.\n", dev->name,
764                                                        adapter->irx_pcb.data.failed ? "failed" : "succeeded");
765                                         break;
766
767
768                                         /*
769                                          * received board statistics
770                                          */
771                                 case CMD_NETWORK_STATISTICS_RESPONSE:
772                                         dev->stats.rx_packets += adapter->irx_pcb.data.netstat.tot_recv;
773                                         dev->stats.tx_packets += adapter->irx_pcb.data.netstat.tot_xmit;
774                                         dev->stats.rx_crc_errors += adapter->irx_pcb.data.netstat.err_CRC;
775                                         dev->stats.rx_frame_errors += adapter->irx_pcb.data.netstat.err_align;
776                                         dev->stats.rx_fifo_errors += adapter->irx_pcb.data.netstat.err_ovrrun;
777                                         dev->stats.rx_over_errors += adapter->irx_pcb.data.netstat.err_res;
778                                         adapter->got[CMD_NETWORK_STATISTICS] = 1;
779                                         if (elp_debug >= 3)
780                                                 printk(KERN_DEBUG "%s: interrupt - statistics response received\n", dev->name);
781                                         break;
782
783                                         /*
784                                          * sent a packet
785                                          */
786                                 case CMD_TRANSMIT_PACKET_COMPLETE:
787                                         if (elp_debug >= 3)
788                                                 printk(KERN_DEBUG "%s: interrupt - packet sent\n", dev->name);
789                                         if (!netif_running(dev))
790                                                 break;
791                                         switch (adapter->irx_pcb.data.xmit_resp.c_stat) {
792                                         case 0xffff:
793                                                 dev->stats.tx_aborted_errors++;
794                                                 printk(KERN_INFO "%s: transmit timed out, network cable problem?\n", dev->name);
795                                                 break;
796                                         case 0xfffe:
797                                                 dev->stats.tx_fifo_errors++;
798                                                 printk(KERN_INFO "%s: transmit timed out, FIFO underrun\n", dev->name);
799                                                 break;
800                                         }
801                                         netif_wake_queue(dev);
802                                         break;
803
804                                         /*
805                                          * some unknown PCB
806                                          */
807                                 default:
808                                         printk(KERN_DEBUG "%s: unknown PCB received - %2.2x\n", dev->name, adapter->irx_pcb.command);
809                                         break;
810                                 }
811                         } else {
812                                 printk(KERN_WARNING "%s: failed to read PCB on interrupt\n", dev->name);
813                                 adapter_reset(dev);
814                         }
815                 }
816
817         } while (icount++ < 5 && (inb_status(dev->base_addr) & (ACRF | DONE)));
818
819         prime_rx(dev);
820
821         /*
822          * indicate no longer in interrupt routine
823          */
824         spin_unlock(&adapter->lock);
825         return IRQ_HANDLED;
826 }
827
828
829 /******************************************************
830  *
831  * open the board
832  *
833  ******************************************************/
834
835 static int elp_open(struct net_device *dev)
836 {
837         elp_device *adapter = netdev_priv(dev);
838         int retval;
839
840         if (elp_debug >= 3)
841                 printk(KERN_DEBUG "%s: request to open device\n", dev->name);
842
843         /*
844          * make sure we actually found the device
845          */
846         if (adapter == NULL) {
847                 printk(KERN_ERR "%s: Opening a non-existent physical device\n", dev->name);
848                 return -EAGAIN;
849         }
850         /*
851          * disable interrupts on the board
852          */
853         outb_control(0, dev);
854
855         /*
856          * clear any pending interrupts
857          */
858         inb_command(dev->base_addr);
859         adapter_reset(dev);
860
861         /*
862          * no receive PCBs active
863          */
864         adapter->rx_active = 0;
865
866         adapter->busy = 0;
867         adapter->send_pcb_semaphore = 0;
868         adapter->rx_backlog.in = 0;
869         adapter->rx_backlog.out = 0;
870
871         spin_lock_init(&adapter->lock);
872
873         /*
874          * install our interrupt service routine
875          */
876         if ((retval = request_irq(dev->irq, &elp_interrupt, 0, dev->name, dev))) {
877                 printk(KERN_ERR "%s: could not allocate IRQ%d\n", dev->name, dev->irq);
878                 return retval;
879         }
880         if ((retval = request_dma(dev->dma, dev->name))) {
881                 free_irq(dev->irq, dev);
882                 printk(KERN_ERR "%s: could not allocate DMA%d channel\n", dev->name, dev->dma);
883                 return retval;
884         }
885         adapter->dma_buffer = (void *) dma_mem_alloc(DMA_BUFFER_SIZE);
886         if (!adapter->dma_buffer) {
887                 printk(KERN_ERR "%s: could not allocate DMA buffer\n", dev->name);
888                 free_dma(dev->dma);
889                 free_irq(dev->irq, dev);
890                 return -ENOMEM;
891         }
892         adapter->dmaing = 0;
893
894         /*
895          * enable interrupts on the board
896          */
897         outb_control(CMDE, dev);
898
899         /*
900          * configure adapter memory: we need 10 multicast addresses, default==0
901          */
902         if (elp_debug >= 3)
903                 printk(KERN_DEBUG "%s: sending 3c505 memory configuration command\n", dev->name);
904         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
905         adapter->tx_pcb.data.memconf.cmd_q = 10;
906         adapter->tx_pcb.data.memconf.rcv_q = 20;
907         adapter->tx_pcb.data.memconf.mcast = 10;
908         adapter->tx_pcb.data.memconf.frame = 20;
909         adapter->tx_pcb.data.memconf.rcv_b = 20;
910         adapter->tx_pcb.data.memconf.progs = 0;
911         adapter->tx_pcb.length = sizeof(struct Memconf);
912         adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] = 0;
913         if (!send_pcb(dev, &adapter->tx_pcb))
914                 printk(KERN_ERR "%s: couldn't send memory configuration command\n", dev->name);
915         else {
916                 unsigned long timeout = jiffies + TIMEOUT;
917                 while (adapter->got[CMD_CONFIGURE_ADAPTER_MEMORY] == 0 && time_before(jiffies, timeout));
918                 if (time_after_eq(jiffies, timeout))
919                         TIMEOUT_MSG(__LINE__);
920         }
921
922
923         /*
924          * configure adapter to receive broadcast messages and wait for response
925          */
926         if (elp_debug >= 3)
927                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
928         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
929         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
930         adapter->tx_pcb.length = 2;
931         adapter->got[CMD_CONFIGURE_82586] = 0;
932         if (!send_pcb(dev, &adapter->tx_pcb))
933                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
934         else {
935                 unsigned long timeout = jiffies + TIMEOUT;
936                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
937                 if (time_after_eq(jiffies, timeout))
938                         TIMEOUT_MSG(__LINE__);
939         }
940
941         /* enable burst-mode DMA */
942         /* outb(0x1, dev->base_addr + PORT_AUXDMA); */
943
944         /*
945          * queue receive commands to provide buffering
946          */
947         prime_rx(dev);
948         if (elp_debug >= 3)
949                 printk(KERN_DEBUG "%s: %d receive PCBs active\n", dev->name, adapter->rx_active);
950
951         /*
952          * device is now officially open!
953          */
954
955         netif_start_queue(dev);
956         return 0;
957 }
958
959
960 /******************************************************
961  *
962  * send a packet to the adapter
963  *
964  ******************************************************/
965
966 static bool send_packet(struct net_device *dev, struct sk_buff *skb)
967 {
968         elp_device *adapter = netdev_priv(dev);
969         unsigned long target;
970         unsigned long flags;
971
972         /*
973          * make sure the length is even and no shorter than 60 bytes
974          */
975         unsigned int nlen = (((skb->len < 60) ? 60 : skb->len) + 1) & (~1);
976
977         if (test_and_set_bit(0, (void *) &adapter->busy)) {
978                 if (elp_debug >= 2)
979                         printk(KERN_DEBUG "%s: transmit blocked\n", dev->name);
980                 return false;
981         }
982
983         dev->stats.tx_bytes += nlen;
984
985         /*
986          * send the adapter a transmit packet command. Ignore segment and offset
987          * and make sure the length is even
988          */
989         adapter->tx_pcb.command = CMD_TRANSMIT_PACKET;
990         adapter->tx_pcb.length = sizeof(struct Xmit_pkt);
991         adapter->tx_pcb.data.xmit_pkt.buf_ofs
992             = adapter->tx_pcb.data.xmit_pkt.buf_seg = 0;        /* Unused */
993         adapter->tx_pcb.data.xmit_pkt.pkt_len = nlen;
994
995         if (!send_pcb(dev, &adapter->tx_pcb)) {
996                 adapter->busy = 0;
997                 return false;
998         }
999         /* if this happens, we die */
1000         if (test_and_set_bit(0, (void *) &adapter->dmaing))
1001                 printk(KERN_DEBUG "%s: tx: DMA %d in progress\n", dev->name, adapter->current_dma.direction);
1002
1003         adapter->current_dma.direction = 1;
1004         adapter->current_dma.start_time = jiffies;
1005
1006         if ((unsigned long)(skb->data + nlen) >= MAX_DMA_ADDRESS || nlen != skb->len) {
1007                 skb_copy_from_linear_data(skb, adapter->dma_buffer, nlen);
1008                 memset(adapter->dma_buffer+skb->len, 0, nlen-skb->len);
1009                 target = isa_virt_to_bus(adapter->dma_buffer);
1010         }
1011         else {
1012                 target = isa_virt_to_bus(skb->data);
1013         }
1014         adapter->current_dma.skb = skb;
1015
1016         flags=claim_dma_lock();
1017         disable_dma(dev->dma);
1018         clear_dma_ff(dev->dma);
1019         set_dma_mode(dev->dma, 0x48);   /* dma memory -> io */
1020         set_dma_addr(dev->dma, target);
1021         set_dma_count(dev->dma, nlen);
1022         outb_control(adapter->hcr_val | DMAE | TCEN, dev);
1023         enable_dma(dev->dma);
1024         release_dma_lock(flags);
1025
1026         if (elp_debug >= 3)
1027                 printk(KERN_DEBUG "%s: DMA transfer started\n", dev->name);
1028
1029         return true;
1030 }
1031
1032 /*
1033  *      The upper layer thinks we timed out
1034  */
1035
1036 static void elp_timeout(struct net_device *dev)
1037 {
1038         int stat;
1039
1040         stat = inb_status(dev->base_addr);
1041         printk(KERN_WARNING "%s: transmit timed out, lost %s?\n", dev->name, (stat & ACRF) ? "interrupt" : "command");
1042         if (elp_debug >= 1)
1043                 printk(KERN_DEBUG "%s: status %#02x\n", dev->name, stat);
1044         dev->trans_start = jiffies;
1045         dev->stats.tx_dropped++;
1046         netif_wake_queue(dev);
1047 }
1048
1049 /******************************************************
1050  *
1051  * start the transmitter
1052  *    return 0 if sent OK, else return 1
1053  *
1054  ******************************************************/
1055
1056 static int elp_start_xmit(struct sk_buff *skb, struct net_device *dev)
1057 {
1058         unsigned long flags;
1059         elp_device *adapter = netdev_priv(dev);
1060
1061         spin_lock_irqsave(&adapter->lock, flags);
1062         check_3c505_dma(dev);
1063
1064         if (elp_debug >= 3)
1065                 printk(KERN_DEBUG "%s: request to send packet of length %d\n", dev->name, (int) skb->len);
1066
1067         netif_stop_queue(dev);
1068
1069         /*
1070          * send the packet at skb->data for skb->len
1071          */
1072         if (!send_packet(dev, skb)) {
1073                 if (elp_debug >= 2) {
1074                         printk(KERN_DEBUG "%s: failed to transmit packet\n", dev->name);
1075                 }
1076                 spin_unlock_irqrestore(&adapter->lock, flags);
1077                 return 1;
1078         }
1079         if (elp_debug >= 3)
1080                 printk(KERN_DEBUG "%s: packet of length %d sent\n", dev->name, (int) skb->len);
1081
1082         /*
1083          * start the transmit timeout
1084          */
1085         dev->trans_start = jiffies;
1086
1087         prime_rx(dev);
1088         spin_unlock_irqrestore(&adapter->lock, flags);
1089         netif_start_queue(dev);
1090         return 0;
1091 }
1092
1093 /******************************************************
1094  *
1095  * return statistics on the board
1096  *
1097  ******************************************************/
1098
1099 static struct net_device_stats *elp_get_stats(struct net_device *dev)
1100 {
1101         elp_device *adapter = netdev_priv(dev);
1102
1103         if (elp_debug >= 3)
1104                 printk(KERN_DEBUG "%s: request for stats\n", dev->name);
1105
1106         /* If the device is closed, just return the latest stats we have,
1107            - we cannot ask from the adapter without interrupts */
1108         if (!netif_running(dev))
1109                 return &dev->stats;
1110
1111         /* send a get statistics command to the board */
1112         adapter->tx_pcb.command = CMD_NETWORK_STATISTICS;
1113         adapter->tx_pcb.length = 0;
1114         adapter->got[CMD_NETWORK_STATISTICS] = 0;
1115         if (!send_pcb(dev, &adapter->tx_pcb))
1116                 printk(KERN_ERR "%s: couldn't send get statistics command\n", dev->name);
1117         else {
1118                 unsigned long timeout = jiffies + TIMEOUT;
1119                 while (adapter->got[CMD_NETWORK_STATISTICS] == 0 && time_before(jiffies, timeout));
1120                 if (time_after_eq(jiffies, timeout)) {
1121                         TIMEOUT_MSG(__LINE__);
1122                         return &dev->stats;
1123                 }
1124         }
1125
1126         /* statistics are now up to date */
1127         return &dev->stats;
1128 }
1129
1130
1131 static void netdev_get_drvinfo(struct net_device *dev,
1132                                struct ethtool_drvinfo *info)
1133 {
1134         strcpy(info->driver, DRV_NAME);
1135         strcpy(info->version, DRV_VERSION);
1136         sprintf(info->bus_info, "ISA 0x%lx", dev->base_addr);
1137 }
1138
1139 static u32 netdev_get_msglevel(struct net_device *dev)
1140 {
1141         return debug;
1142 }
1143
1144 static void netdev_set_msglevel(struct net_device *dev, u32 level)
1145 {
1146         debug = level;
1147 }
1148
1149 static const struct ethtool_ops netdev_ethtool_ops = {
1150         .get_drvinfo            = netdev_get_drvinfo,
1151         .get_msglevel           = netdev_get_msglevel,
1152         .set_msglevel           = netdev_set_msglevel,
1153 };
1154
1155 /******************************************************
1156  *
1157  * close the board
1158  *
1159  ******************************************************/
1160
1161 static int elp_close(struct net_device *dev)
1162 {
1163         elp_device *adapter = netdev_priv(dev);
1164
1165         if (elp_debug >= 3)
1166                 printk(KERN_DEBUG "%s: request to close device\n", dev->name);
1167
1168         netif_stop_queue(dev);
1169
1170         /* Someone may request the device statistic information even when
1171          * the interface is closed. The following will update the statistics
1172          * structure in the driver, so we'll be able to give current statistics.
1173          */
1174         (void) elp_get_stats(dev);
1175
1176         /*
1177          * disable interrupts on the board
1178          */
1179         outb_control(0, dev);
1180
1181         /*
1182          * release the IRQ
1183          */
1184         free_irq(dev->irq, dev);
1185
1186         free_dma(dev->dma);
1187         free_pages((unsigned long) adapter->dma_buffer, get_order(DMA_BUFFER_SIZE));
1188
1189         return 0;
1190 }
1191
1192
1193 /************************************************************
1194  *
1195  * Set multicast list
1196  * num_addrs==0: clear mc_list
1197  * num_addrs==-1: set promiscuous mode
1198  * num_addrs>0: set mc_list
1199  *
1200  ************************************************************/
1201
1202 static void elp_set_mc_list(struct net_device *dev)
1203 {
1204         elp_device *adapter = netdev_priv(dev);
1205         struct dev_mc_list *dmi = dev->mc_list;
1206         int i;
1207         unsigned long flags;
1208
1209         if (elp_debug >= 3)
1210                 printk(KERN_DEBUG "%s: request to set multicast list\n", dev->name);
1211
1212         spin_lock_irqsave(&adapter->lock, flags);
1213
1214         if (!(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
1215                 /* send a "load multicast list" command to the board, max 10 addrs/cmd */
1216                 /* if num_addrs==0 the list will be cleared */
1217                 adapter->tx_pcb.command = CMD_LOAD_MULTICAST_LIST;
1218                 adapter->tx_pcb.length = 6 * dev->mc_count;
1219                 for (i = 0; i < dev->mc_count; i++) {
1220                         memcpy(adapter->tx_pcb.data.multicast[i], dmi->dmi_addr, 6);
1221                         dmi = dmi->next;
1222                 }
1223                 adapter->got[CMD_LOAD_MULTICAST_LIST] = 0;
1224                 if (!send_pcb(dev, &adapter->tx_pcb))
1225                         printk(KERN_ERR "%s: couldn't send set_multicast command\n", dev->name);
1226                 else {
1227                         unsigned long timeout = jiffies + TIMEOUT;
1228                         while (adapter->got[CMD_LOAD_MULTICAST_LIST] == 0 && time_before(jiffies, timeout));
1229                         if (time_after_eq(jiffies, timeout)) {
1230                                 TIMEOUT_MSG(__LINE__);
1231                         }
1232                 }
1233                 if (dev->mc_count)
1234                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD | RECV_MULTI;
1235                 else            /* num_addrs == 0 */
1236                         adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_BROAD;
1237         } else
1238                 adapter->tx_pcb.data.configure = NO_LOOPBACK | RECV_PROMISC;
1239         /*
1240          * configure adapter to receive messages (as specified above)
1241          * and wait for response
1242          */
1243         if (elp_debug >= 3)
1244                 printk(KERN_DEBUG "%s: sending 82586 configure command\n", dev->name);
1245         adapter->tx_pcb.command = CMD_CONFIGURE_82586;
1246         adapter->tx_pcb.length = 2;
1247         adapter->got[CMD_CONFIGURE_82586] = 0;
1248         if (!send_pcb(dev, &adapter->tx_pcb))
1249         {
1250                 spin_unlock_irqrestore(&adapter->lock, flags);
1251                 printk(KERN_ERR "%s: couldn't send 82586 configure command\n", dev->name);
1252         }
1253         else {
1254                 unsigned long timeout = jiffies + TIMEOUT;
1255                 spin_unlock_irqrestore(&adapter->lock, flags);
1256                 while (adapter->got[CMD_CONFIGURE_82586] == 0 && time_before(jiffies, timeout));
1257                 if (time_after_eq(jiffies, timeout))
1258                         TIMEOUT_MSG(__LINE__);
1259         }
1260 }
1261
1262 /************************************************************
1263  *
1264  * A couple of tests to see if there's 3C505 or not
1265  * Called only by elp_autodetect
1266  ************************************************************/
1267
1268 static int __init elp_sense(struct net_device *dev)
1269 {
1270         int addr = dev->base_addr;
1271         const char *name = dev->name;
1272         byte orig_HSR;
1273
1274         if (!request_region(addr, ELP_IO_EXTENT, "3c505"))
1275                 return -ENODEV;
1276
1277         orig_HSR = inb_status(addr);
1278
1279         if (elp_debug > 0)
1280                 printk(search_msg, name, addr);
1281
1282         if (orig_HSR == 0xff) {
1283                 if (elp_debug > 0)
1284                         printk(notfound_msg, 1);
1285                 goto out;
1286         }
1287
1288         /* Wait for a while; the adapter may still be booting up */
1289         if (elp_debug > 0)
1290                 printk(stilllooking_msg);
1291
1292         if (orig_HSR & DIR) {
1293                 /* If HCR.DIR is up, we pull it down. HSR.DIR should follow. */
1294                 outb(0, dev->base_addr + PORT_CONTROL);
1295                 msleep(300);
1296                 if (inb_status(addr) & DIR) {
1297                         if (elp_debug > 0)
1298                                 printk(notfound_msg, 2);
1299                         goto out;
1300                 }
1301         } else {
1302                 /* If HCR.DIR is down, we pull it up. HSR.DIR should follow. */
1303                 outb(DIR, dev->base_addr + PORT_CONTROL);
1304                 msleep(300);
1305                 if (!(inb_status(addr) & DIR)) {
1306                         if (elp_debug > 0)
1307                                 printk(notfound_msg, 3);
1308                         goto out;
1309                 }
1310         }
1311         /*
1312          * It certainly looks like a 3c505.
1313          */
1314         if (elp_debug > 0)
1315                 printk(found_msg);
1316
1317         return 0;
1318 out:
1319         release_region(addr, ELP_IO_EXTENT);
1320         return -ENODEV;
1321 }
1322
1323 /*************************************************************
1324  *
1325  * Search through addr_list[] and try to find a 3C505
1326  * Called only by eplus_probe
1327  *************************************************************/
1328
1329 static int __init elp_autodetect(struct net_device *dev)
1330 {
1331         int idx = 0;
1332
1333         /* if base address set, then only check that address
1334            otherwise, run through the table */
1335         if (dev->base_addr != 0) {      /* dev->base_addr == 0 ==> plain autodetect */
1336                 if (elp_sense(dev) == 0)
1337                         return dev->base_addr;
1338         } else
1339                 while ((dev->base_addr = addr_list[idx++])) {
1340                         if (elp_sense(dev) == 0)
1341                                 return dev->base_addr;
1342                 }
1343
1344         /* could not find an adapter */
1345         if (elp_debug > 0)
1346                 printk(couldnot_msg, dev->name);
1347
1348         return 0;               /* Because of this, the layer above will return -ENODEV */
1349 }
1350
1351
1352 /******************************************************
1353  *
1354  * probe for an Etherlink Plus board at the specified address
1355  *
1356  ******************************************************/
1357
1358 /* There are three situations we need to be able to detect here:
1359
1360  *  a) the card is idle
1361  *  b) the card is still booting up
1362  *  c) the card is stuck in a strange state (some DOS drivers do this)
1363  *
1364  * In case (a), all is well.  In case (b), we wait 10 seconds to see if the
1365  * card finishes booting, and carry on if so.  In case (c), we do a hard reset,
1366  * loop round, and hope for the best.
1367  *
1368  * This is all very unpleasant, but hopefully avoids the problems with the old
1369  * probe code (which had a 15-second delay if the card was idle, and didn't
1370  * work at all if it was in a weird state).
1371  */
1372
1373 static int __init elplus_setup(struct net_device *dev)
1374 {
1375         elp_device *adapter = netdev_priv(dev);
1376         int i, tries, tries1, okay;
1377         unsigned long timeout;
1378         unsigned long cookie = 0;
1379         int err = -ENODEV;
1380
1381         /*
1382          *  setup adapter structure
1383          */
1384
1385         dev->base_addr = elp_autodetect(dev);
1386         if (!dev->base_addr)
1387                 return -ENODEV;
1388
1389         adapter->send_pcb_semaphore = 0;
1390
1391         for (tries1 = 0; tries1 < 3; tries1++) {
1392                 outb_control((adapter->hcr_val | CMDE) & ~DIR, dev);
1393                 /* First try to write just one byte, to see if the card is
1394                  * responding at all normally.
1395                  */
1396                 timeout = jiffies + 5*HZ/100;
1397                 okay = 0;
1398                 while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1399                 if ((inb_status(dev->base_addr) & HCRE)) {
1400                         outb_command(0, dev->base_addr);        /* send a spurious byte */
1401                         timeout = jiffies + 5*HZ/100;
1402                         while (time_before(jiffies, timeout) && !(inb_status(dev->base_addr) & HCRE));
1403                         if (inb_status(dev->base_addr) & HCRE)
1404                                 okay = 1;
1405                 }
1406                 if (!okay) {
1407                         /* Nope, it's ignoring the command register.  This means that
1408                          * either it's still booting up, or it's died.
1409                          */
1410                         printk(KERN_ERR "%s: command register wouldn't drain, ", dev->name);
1411                         if ((inb_status(dev->base_addr) & 7) == 3) {
1412                                 /* If the adapter status is 3, it *could* still be booting.
1413                                  * Give it the benefit of the doubt for 10 seconds.
1414                                  */
1415                                 printk("assuming 3c505 still starting\n");
1416                                 timeout = jiffies + 10*HZ;
1417                                 while (time_before(jiffies, timeout) && (inb_status(dev->base_addr) & 7));
1418                                 if (inb_status(dev->base_addr) & 7) {
1419                                         printk(KERN_ERR "%s: 3c505 failed to start\n", dev->name);
1420                                 } else {
1421                                         okay = 1;  /* It started */
1422                                 }
1423                         } else {
1424                                 /* Otherwise, it must just be in a strange
1425                                  * state.  We probably need to kick it.
1426                                  */
1427                                 printk("3c505 is sulking\n");
1428                         }
1429                 }
1430                 for (tries = 0; tries < 5 && okay; tries++) {
1431
1432                         /*
1433                          * Try to set the Ethernet address, to make sure that the board
1434                          * is working.
1435                          */
1436                         adapter->tx_pcb.command = CMD_STATION_ADDRESS;
1437                         adapter->tx_pcb.length = 0;
1438                         cookie = probe_irq_on();
1439                         if (!send_pcb(dev, &adapter->tx_pcb)) {
1440                                 printk(KERN_ERR "%s: could not send first PCB\n", dev->name);
1441                                 probe_irq_off(cookie);
1442                                 continue;
1443                         }
1444                         if (!receive_pcb(dev, &adapter->rx_pcb)) {
1445                                 printk(KERN_ERR "%s: could not read first PCB\n", dev->name);
1446                                 probe_irq_off(cookie);
1447                                 continue;
1448                         }
1449                         if ((adapter->rx_pcb.command != CMD_ADDRESS_RESPONSE) ||
1450                             (adapter->rx_pcb.length != 6)) {
1451                                 printk(KERN_ERR "%s: first PCB wrong (%d, %d)\n", dev->name, adapter->rx_pcb.command, adapter->rx_pcb.length);
1452                                 probe_irq_off(cookie);
1453                                 continue;
1454                         }
1455                         goto okay;
1456                 }
1457                 /* It's broken.  Do a hard reset to re-initialise the board,
1458                  * and try again.
1459                  */
1460                 printk(KERN_INFO "%s: resetting adapter\n", dev->name);
1461                 outb_control(adapter->hcr_val | FLSH | ATTN, dev);
1462                 outb_control(adapter->hcr_val & ~(FLSH | ATTN), dev);
1463         }
1464         printk(KERN_ERR "%s: failed to initialise 3c505\n", dev->name);
1465         goto out;
1466
1467       okay:
1468         if (dev->irq) {         /* Is there a preset IRQ? */
1469                 int rpt = probe_irq_off(cookie);
1470                 if (dev->irq != rpt) {
1471                         printk(KERN_WARNING "%s: warning, irq %d configured but %d detected\n", dev->name, dev->irq, rpt);
1472                 }
1473                 /* if dev->irq == probe_irq_off(cookie), all is well */
1474         } else                 /* No preset IRQ; just use what we can detect */
1475                 dev->irq = probe_irq_off(cookie);
1476         switch (dev->irq) {    /* Legal, sane? */
1477         case 0:
1478                 printk(KERN_ERR "%s: IRQ probe failed: check 3c505 jumpers.\n",
1479                        dev->name);
1480                 goto out;
1481         case 1:
1482         case 6:
1483         case 8:
1484         case 13:
1485                 printk(KERN_ERR "%s: Impossible IRQ %d reported by probe_irq_off().\n",
1486                        dev->name, dev->irq);
1487                        goto out;
1488         }
1489         /*
1490          *  Now we have the IRQ number so we can disable the interrupts from
1491          *  the board until the board is opened.
1492          */
1493         outb_control(adapter->hcr_val & ~CMDE, dev);
1494
1495         /*
1496          * copy Ethernet address into structure
1497          */
1498         for (i = 0; i < 6; i++)
1499                 dev->dev_addr[i] = adapter->rx_pcb.data.eth_addr[i];
1500
1501         /* find a DMA channel */
1502         if (!dev->dma) {
1503                 if (dev->mem_start) {
1504                         dev->dma = dev->mem_start & 7;
1505                 }
1506                 else {
1507                         printk(KERN_WARNING "%s: warning, DMA channel not specified, using default\n", dev->name);
1508                         dev->dma = ELP_DMA;
1509                 }
1510         }
1511
1512         /*
1513          * print remainder of startup message
1514          */
1515         printk(KERN_INFO "%s: 3c505 at %#lx, irq %d, dma %d, "
1516                "addr %pM, ",
1517                dev->name, dev->base_addr, dev->irq, dev->dma,
1518                dev->dev_addr);
1519
1520         /*
1521          * read more information from the adapter
1522          */
1523
1524         adapter->tx_pcb.command = CMD_ADAPTER_INFO;
1525         adapter->tx_pcb.length = 0;
1526         if (!send_pcb(dev, &adapter->tx_pcb) ||
1527             !receive_pcb(dev, &adapter->rx_pcb) ||
1528             (adapter->rx_pcb.command != CMD_ADAPTER_INFO_RESPONSE) ||
1529             (adapter->rx_pcb.length != 10)) {
1530                 printk("not responding to second PCB\n");
1531         }
1532         printk("rev %d.%d, %dk\n", adapter->rx_pcb.data.info.major_vers, adapter->rx_pcb.data.info.minor_vers, adapter->rx_pcb.data.info.RAM_sz);
1533
1534         /*
1535          * reconfigure the adapter memory to better suit our purposes
1536          */
1537         adapter->tx_pcb.command = CMD_CONFIGURE_ADAPTER_MEMORY;
1538         adapter->tx_pcb.length = 12;
1539         adapter->tx_pcb.data.memconf.cmd_q = 8;
1540         adapter->tx_pcb.data.memconf.rcv_q = 8;
1541         adapter->tx_pcb.data.memconf.mcast = 10;
1542         adapter->tx_pcb.data.memconf.frame = 10;
1543         adapter->tx_pcb.data.memconf.rcv_b = 10;
1544         adapter->tx_pcb.data.memconf.progs = 0;
1545         if (!send_pcb(dev, &adapter->tx_pcb) ||
1546             !receive_pcb(dev, &adapter->rx_pcb) ||
1547             (adapter->rx_pcb.command != CMD_CONFIGURE_ADAPTER_RESPONSE) ||
1548             (adapter->rx_pcb.length != 2)) {
1549                 printk(KERN_ERR "%s: could not configure adapter memory\n", dev->name);
1550         }
1551         if (adapter->rx_pcb.data.configure) {
1552                 printk(KERN_ERR "%s: adapter configuration failed\n", dev->name);
1553         }
1554
1555         dev->open = elp_open;                           /* local */
1556         dev->stop = elp_close;                          /* local */
1557         dev->get_stats = elp_get_stats;                 /* local */
1558         dev->hard_start_xmit = elp_start_xmit;          /* local */
1559         dev->tx_timeout = elp_timeout;                  /* local */
1560         dev->watchdog_timeo = 10*HZ;
1561         dev->set_multicast_list = elp_set_mc_list;      /* local */
1562         dev->ethtool_ops = &netdev_ethtool_ops;         /* local */
1563
1564         dev->mem_start = dev->mem_end = 0;
1565
1566         err = register_netdev(dev);
1567         if (err)
1568                 goto out;
1569
1570         return 0;
1571 out:
1572         release_region(dev->base_addr, ELP_IO_EXTENT);
1573         return err;
1574 }
1575
1576 #ifndef MODULE
1577 struct net_device * __init elplus_probe(int unit)
1578 {
1579         struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1580         int err;
1581         if (!dev)
1582                 return ERR_PTR(-ENOMEM);
1583
1584         sprintf(dev->name, "eth%d", unit);
1585         netdev_boot_setup_check(dev);
1586
1587         err = elplus_setup(dev);
1588         if (err) {
1589                 free_netdev(dev);
1590                 return ERR_PTR(err);
1591         }
1592         return dev;
1593 }
1594
1595 #else
1596 static struct net_device *dev_3c505[ELP_MAX_CARDS];
1597 static int io[ELP_MAX_CARDS];
1598 static int irq[ELP_MAX_CARDS];
1599 static int dma[ELP_MAX_CARDS];
1600 module_param_array(io, int, NULL, 0);
1601 module_param_array(irq, int, NULL, 0);
1602 module_param_array(dma, int, NULL, 0);
1603 MODULE_PARM_DESC(io, "EtherLink Plus I/O base address(es)");
1604 MODULE_PARM_DESC(irq, "EtherLink Plus IRQ number(s) (assigned)");
1605 MODULE_PARM_DESC(dma, "EtherLink Plus DMA channel(s)");
1606
1607 int __init init_module(void)
1608 {
1609         int this_dev, found = 0;
1610
1611         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1612                 struct net_device *dev = alloc_etherdev(sizeof(elp_device));
1613                 if (!dev)
1614                         break;
1615
1616                 dev->irq = irq[this_dev];
1617                 dev->base_addr = io[this_dev];
1618                 if (dma[this_dev]) {
1619                         dev->dma = dma[this_dev];
1620                 } else {
1621                         dev->dma = ELP_DMA;
1622                         printk(KERN_WARNING "3c505.c: warning, using default DMA channel,\n");
1623                 }
1624                 if (io[this_dev] == 0) {
1625                         if (this_dev) {
1626                                 free_netdev(dev);
1627                                 break;
1628                         }
1629                         printk(KERN_NOTICE "3c505.c: module autoprobe not recommended, give io=xx.\n");
1630                 }
1631                 if (elplus_setup(dev) != 0) {
1632                         printk(KERN_WARNING "3c505.c: Failed to register card at 0x%x.\n", io[this_dev]);
1633                         free_netdev(dev);
1634                         break;
1635                 }
1636                 dev_3c505[this_dev] = dev;
1637                 found++;
1638         }
1639         if (!found)
1640                 return -ENODEV;
1641         return 0;
1642 }
1643
1644 void __exit cleanup_module(void)
1645 {
1646         int this_dev;
1647
1648         for (this_dev = 0; this_dev < ELP_MAX_CARDS; this_dev++) {
1649                 struct net_device *dev = dev_3c505[this_dev];
1650                 if (dev) {
1651                         unregister_netdev(dev);
1652                         release_region(dev->base_addr, ELP_IO_EXTENT);
1653                         free_netdev(dev);
1654                 }
1655         }
1656 }
1657
1658 #endif                          /* MODULE */
1659 MODULE_LICENSE("GPL");